DIY BiQuad 11dbi antenna tutorial! - Page 27 - RC Groups
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May 16, 2011, 03:23 PM
Registered User
Nice , so maybe I could do without a booster ...I know you are not the expert on boosters but do you maybe have an idea why some booster were failling over time for some guys, maybe because they weren't using attenuators to lower the signal?
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May 16, 2011, 03:28 PM
Registered User
Alex,

Today i made 14km using this antenna on RX i'm glad with our antenna
May 19, 2011, 11:05 PM
Registered User
Flightbox's Avatar
IBCrazy How are you getting the solder to stick to the galv sheet. Mine seems to break free real easy.
May 20, 2011, 05:16 AM
Fly like never crash as always
tascheri's Avatar
Quote:
Originally Posted by Flightbox
IBCrazy How are you getting the solder to stick to the galv sheet. Mine seems to break free real easy.
You need a more powerful soldering iron!!
May 20, 2011, 07:55 AM
Engineer for Christ
IBCrazy's Avatar
Quote:
Originally Posted by Flightbox
IBCrazy How are you getting the solder to stick to the galv sheet. Mine seems to break free real easy.
Small torch
May 20, 2011, 08:33 AM
Honey Badger
Blue Chip's Avatar
Quote:
Originally Posted by IBCrazy
Small torch

Same. Also - I found it helps to take some sandpaper and really rough / clean the area on the reflector. I have not had much luck using and iron...the small torch works well.
May 20, 2011, 08:52 PM
Registered User
Flightbox's Avatar
doesn't burn the outer cover of the coaxial??
May 20, 2011, 11:31 PM
Engineer for Christ
IBCrazy's Avatar
Quote:
Originally Posted by Flightbox
doesn't burn the outer cover of the coaxial??
You need to tin the galvanized sheet first.


Take the torch and heat the plate until it accepts the solder. Remove the flame and then use the soldering iron to remelt the solder and bind it to the cable.

-Alex
May 21, 2011, 01:18 AM
Registered User
Flightbox's Avatar
Thank you I finally got the solder to stick. Alex this 11dbi BiQuad is awesome its the best antenna I have used. I just need to figure out how to get a signal over head and a little behind. Thanks again
May 22, 2011, 02:03 PM
summitmk3
roadgraders's Avatar
I bought one of your (IBCrazy) 900mhz BiQuad antenna from readymaderc. I know the beam is 50 degrees but for an example how wide is that actually at 300 ft or 1/2 mile for examples? Is there a chart to show this for the different types of antennas?
May 22, 2011, 09:20 PM
Engineer for Christ
IBCrazy's Avatar
50 degrees is the -3db point.

Thus at the folowing angles the gain is as such:

0 - 11db
50 - 8db
90 - 5db
120 - 2db
May 22, 2011, 11:23 PM
summitmk3
roadgraders's Avatar
Quote:
Originally Posted by IBCrazy
50 degrees is the -3db point.

Thus at the folowing angles the gain is as such:

0 - 11db
50 - 8db
90 - 5db
120 - 2db
I was talking about on how wide of path does the antenna cover at a distance, like for example 50 ft at 300 ft and so on?
May 23, 2011, 08:39 AM
Engineer for Christ
IBCrazy's Avatar
At 300 feet you can fly anywhere with the BiQuad. It will still pick up your signal. Use the angle geometry measurement I posted to get effective coverage capability.

In other words, if you are 25 degrees off center (edge of beam), your gain will be 8 dbi - equal to a patch antenna dead center.

If you go to 60 degrees off center, you will only have 2dbi gain - equal to a dipole.

I think that is the best way I can explain it.

-Alex
May 23, 2011, 10:02 AM
Air Crash Expert
sawman's Avatar
Quote:
Originally Posted by roadgraders
I was talking about on how wide of path does the antenna cover at a distance, like for example 50 ft at 300 ft and so on?
Trigonometry 101 http://villavu.com/forum/showthread.php?t=22334

But to answer your question, a 50 degree beam width will be 250 feet wide at 300 feet from pilot....2200 feet at half a mile...all approximate as many variations come into play.
May 23, 2011, 06:03 PM
summitmk3
roadgraders's Avatar
Quote:
Originally Posted by sawman
Trigonometry 101 http://villavu.com/forum/showthread.php?t=22334

But to answer your question, a 50 degree beam width will be 250 feet wide at 300 feet from pilot....2200 feet at half a mile...all approximate as many variations come into play.
Thanks guys! Math is not one of my strong suits.


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